Found a 55 year old Holiday Cactus at a garage sale this morning!

So here it is. What can I do to help it? I'm in the USA zone 6b and the previous owner said it was in a basement. I don't know how much light it was getting but I'm thinking it needs more? Should I top it off with cactus soil or repot?

The pot has a drainage hole so that's great. The soil is pretty eroded though, does that really matter?

New shoots are sprouting from the base! Can it be full and bushy ever again? I realized in the car ride home that the bark is just the leaves! Each segment of the bark was once a leaf! Gnarly!